An insulator is a material or object in which charges are not free to move. In other words it’s a material or object that holds in charges and doesn’t move to other objects. It can also be an object that resists the flow of electrical current. Some examples of insulators are rubber, plastic, wood and glass. That’s why the coating around your electronic chargers is rubber or plastic, so you don’t get shocked. A conductor is the opposite of an insulator; it is an object or material that allows charges to move freely. Anything metal is a conductor of electricity, which is why all plugs are made from metal.
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